+/*
+ * This file is part of the coreboot project.
+ *
+ * It was originally based on the Linux kernel (arch/i386/kernel/pci-pc.c).
+ *
+ * Modifications are:
+ * Copyright (C) 2003 Eric Biederman <ebiederm@xmission.com>
+ * Copyright (C) 2003-2004 Linux Networx
+ * (Written by Eric Biederman <ebiederman@lnxi.com> for Linux Networx)
+ * Copyright (C) 2003 Ronald G. Minnich <rminnich@gmail.com>
+ * Copyright (C) 2004-2005 Li-Ta Lo <ollie@lanl.gov>
+ * Copyright (C) 2005-2006 Tyan
+ * (Written by Yinghai Lu <yhlu@tyan.com> for Tyan)
+ * Copyright (C) 2005-2006 Stefan Reinauer <stepan@openbios.org>
+ */
+
/*
* (c) 1999--2000 Martin Mares <mj@suse.cz>
- * (c) 2003 Eric Biederman <ebiederm@xmission.com>
- * (c) 2003 Linux Networx
*/
/* lots of mods by ron minnich (rminnich@lanl.gov), with
* the final architecture guidance from Tom Merritt (tjm@codegen.com)
int link;
spin_lock(&dev_lock);
+
/* Find the last child of our parent */
for(child = parent->children; child && child->sibling; ) {
child = child->sibling;
}
+
dev = malloc(sizeof(*dev));
if (dev == 0) {
die("DEV: out of memory.\n");
memset(dev, 0, sizeof(*dev));
memcpy(&dev->path, path, sizeof(*path));
-
/* Initialize the back pointers in the link fields */
for(link = 0; link < MAX_LINKS; link++) {
dev->link[link].dev = dev;
dev->link[link].link = link;
}
-
+
/* By default devices are enabled */
dev->enabled = 1;
}
if (!(links & (1 << link))) {
links |= (1 << link);
- read_resources(&curdev->link[resource->index]);
-
+ read_resources(&curdev->link[link]);
}
}
}
int seen_last;
};
-static void pick_largest_resource(struct pick_largest_state *state,
+static void pick_largest_resource(void *gp,
struct device *dev, struct resource *resource)
{
+ struct pick_largest_state *state = gp;
struct resource *last;
last = state->last;
/* Be certain to pick the successor to last */
state->seen_last = 1;
return;
}
+ if (resource->flags & IORESOURCE_FIXED ) return; //skip it
if (last && (
(last->align < resource->align) ||
((last->align == resource->align) &&
if (!state->result ||
(state->result->align < resource->align) ||
((state->result->align == resource->align) &&
- (state->result->size < resource->size))) {
+ (state->result->size < resource->size)))
+ {
state->result_dev = dev;
state->result = resource;
}
}
-static void find_largest_resource(struct pick_largest_state *state,
- struct bus *bus, unsigned long type_mask, unsigned long type)
-{
- struct device *curdev;
- for(curdev = bus->children; curdev; curdev = curdev->sibling) {
- int i;
- for(i = 0; i < curdev->resources; i++) {
- struct resource *resource = &curdev->resource[i];
- /* If it isn't the right kind of resource ignore it */
- if ((resource->flags & type_mask) != type) {
- continue;
- }
- /* If it is a subtractive resource recurse */
- if (resource->flags & IORESOURCE_SUBTRACTIVE) {
- struct bus *subbus;
- subbus = &curdev->link[resource->index];
- find_largest_resource(state, subbus, type_mask, type);
- continue;
- }
- /* See if this is the largest resource */
- pick_largest_resource(state, curdev, resource);
- }
- }
-}
-
static struct device *largest_resource(struct bus *bus, struct resource **result_res,
unsigned long type_mask, unsigned long type)
{
state.result = 0;
state.seen_last = 0;
- find_largest_resource(&state, bus, type_mask, type);
+ search_bus_resources(bus, type_mask, type, pick_largest_resource, &state);
*result_res = state.result;
return state.result_dev;
min_align = 0;
base = bridge->base;
- printk_spew("%s compute_allocate_%s: base: %08lx size: %08lx align: %d gran: %d\n",
+ printk_spew("%s compute_allocate_%s: base: %08Lx size: %08Lx align: %d gran: %d\n",
dev_path(bus->dev),
(bridge->flags & IORESOURCE_IO)? "io":
(bridge->flags & IORESOURCE_PREFETCH)? "prefmem" : "mem",
base, bridge->size, bridge->align, bridge->gran);
-
/* We want different minimum alignments for different kinds of
* resources. These minimums are not device type specific
* but resource type specific.
* return them. Some resources must be set even when they have
* no size. PCI bridge resources are a good example of this.
*/
-
/* Propogate the resource alignment to the bridge register */
if (resource->align > bridge->align) {
bridge->align = resource->align;
}
- /* Propogate the resource limit to the bridge register */
- if (bridge->limit > resource->limit) {
- bridge->limit = resource->limit;
- }
- /* Artificially deny limits between DEVICE_MEM_HIGH and 0xffffffff */
- if ((bridge->limit > DEVICE_MEM_HIGH) && (bridge->limit <= 0xffffffff)) {
- bridge->limit = DEVICE_MEM_HIGH;
- }
-
/* Make certain we are dealing with a good minimum size */
size = resource->size;
align = resource->align;
if (align < min_align) {
align = min_align;
}
+
if (resource->flags & IORESOURCE_FIXED) {
continue;
}
+
+ /* Propogate the resource limit to the bridge register */
+ if (bridge->limit > resource->limit) {
+ bridge->limit = resource->limit;
+ }
+ /* Artificially deny limits between DEVICE_MEM_HIGH and 0xffffffff */
+ if ((bridge->limit > DEVICE_MEM_HIGH) && (bridge->limit <= 0xffffffff)) {
+ bridge->limit = DEVICE_MEM_HIGH;
+ }
if (resource->flags & IORESOURCE_IO) {
/* Don't allow potential aliases over the
* legacy pci expansion card addresses.
*/
bridge->size = round(base, bridge->gran) - bridge->base;
- printk_spew("%s compute_allocate_%s: base: %08lx size: %08lx align: %d gran: %d done\n",
+ printk_spew("%s compute_allocate_%s: base: %08Lx size: %08Lx align: %d gran: %d done\n",
dev_path(bus->dev),
(bridge->flags & IORESOURCE_IO)? "io":
(bridge->flags & IORESOURCE_PREFETCH)? "prefmem" : "mem",
}
+#if CONFIG_CONSOLE_VGA == 1
+device_t vga_pri = 0;
static void allocate_vga_resource(void)
{
#warning "FIXME modify allocate_vga_resource so it is less pci centric!"
#warning "This function knows to much about PCI stuff, it should be just a ietrator/visitor."
/* FIXME handle the VGA pallette snooping */
- struct device *dev, *vga;
+ struct device *dev, *vga, *vga_onboard, *vga_first, *vga_last;
struct bus *bus;
bus = 0;
vga = 0;
+ vga_onboard = 0;
+ vga_first = 0;
+ vga_last = 0;
for(dev = all_devices; dev; dev = dev->next) {
+ if (!dev->enabled) continue;
if (((dev->class >> 16) == PCI_BASE_CLASS_DISPLAY) &&
((dev->class >> 8) != PCI_CLASS_DISPLAY_OTHER))
{
- if (!vga) {
- printk_debug("Allocating VGA resource %s\n",
- dev_path(dev));
- vga = dev;
- }
- if (vga == dev) {
- /* All legacy VGA cards have MEM & I/O space registers */
- dev->command |= PCI_COMMAND_MEMORY | PCI_COMMAND_IO;
- } else {
- /* It isn't safe to enable other VGA cards */
- dev->command &= ~(PCI_COMMAND_MEMORY | PCI_COMMAND_IO);
- }
+ if (!vga_first) {
+ if (dev->on_mainboard) {
+ vga_onboard = dev;
+ } else {
+ vga_first = dev;
+ }
+ } else {
+ if (dev->on_mainboard) {
+ vga_onboard = dev;
+ } else {
+ vga_last = dev;
+ }
+ }
+
+ /* It isn't safe to enable other VGA cards */
+ dev->command &= ~(PCI_COMMAND_MEMORY | PCI_COMMAND_IO);
}
}
+
+ vga = vga_last;
+
+ if(!vga) {
+ vga = vga_first;
+ }
+
+#if CONFIG_CONSOLE_VGA_ONBOARD_AT_FIRST == 1
+ if (vga_onboard) // will use on board vga as pri
+#else
+ if (!vga) // will use last add on adapter as pri
+#endif
+ {
+ vga = vga_onboard;
+ }
+
+
if (vga) {
+ /* vga is first add on card or the only onboard vga */
+ printk_debug("Allocating VGA resource %s\n", dev_path(vga));
+ /* All legacy VGA cards have MEM & I/O space registers */
+ vga->command |= (PCI_COMMAND_MEMORY | PCI_COMMAND_IO);
+ vga_pri = vga;
bus = vga->bus;
}
/* Now walk up the bridges setting the VGA enable */
while(bus) {
+ printk_debug("Setting PCI_BRIDGE_CTL_VGA for bridge %s\n",
+ dev_path(bus->dev));
bus->bridge_ctrl |= PCI_BRIDGE_CTL_VGA;
bus = (bus == bus->dev->bus)? 0 : bus->dev->bus;
}
}
+#endif
-/** Assign the computed resources to the bridges and devices on the bus.
- * Recurse to any bridges found on this bus first. Then do the devices
- * on this bus.
- *
+
+/**
+ * @brief Assign the computed resources to the devices on the bus.
+ *
* @param bus Pointer to the structure for this bus
- */
+ *
+ * Use the device specific set_resources method to store the computed
+ * resources to hardware. For bridge devices, the set_resources() method
+ * has to recurse into every down stream buses.
+ *
+ * Mutual recursion:
+ * assign_resources() -> device_operation::set_resources()
+ * device_operation::set_resources() -> assign_resources()
+ */
void assign_resources(struct bus *bus)
{
struct device *curdev;
*
* The parent's resources should be enabled first to avoid having enabling
* order problem. This is done by calling the parent's enable_resources()
- * method and let that method to call it's children's enable_resoruces() via
- * enable_childrens_resources().
+ * method and let that method to call it's children's enable_resoruces()
+ * method via the (global) enable_childrens_resources().
*
* Indirect mutual recursion:
+ * enable_resources() -> device_operations::enable_resource()
+ * device_operations::enable_resource() -> enable_children_resources()
+ * enable_children_resources() -> enable_resources()
*/
void enable_resources(struct device *dev)
{
dev->ops->enable_resources(dev);
}
+/**
+ * @brief Reset all of the devices a bus
+ *
+ * Reset all of the devices on a bus and clear the bus's reset_needed flag.
+ *
+ * @param bus pointer to the bus structure
+ *
+ * @return 1 if the bus was successfully reset, 0 otherwise.
+ *
+ */
+int reset_bus(struct bus *bus)
+{
+ if (bus && bus->dev && bus->dev->ops && bus->dev->ops->reset_bus)
+ {
+ bus->dev->ops->reset_bus(bus);
+ bus->reset_needed = 0;
+ return 1;
+ }
+ return 0;
+}
+
+/**
+ * @brief Scan for devices on a bus.
+ *
+ * If there are bridges on the bus, recursively scan the buses behind the bridges.
+ * If the setting up and tuning of the bus causes a reset to be required,
+ * reset the bus and scan it again.
+ *
+ * @param bus pointer to the bus device
+ * @param max current bus number
+ *
+ * @return The maximum bus number found, after scanning all subordinate busses
+ */
+unsigned int scan_bus(device_t bus, unsigned int max)
+{
+ unsigned int new_max;
+ int do_scan_bus;
+ if ( !bus ||
+ !bus->enabled ||
+ !bus->ops ||
+ !bus->ops->scan_bus)
+ {
+ return max;
+ }
+ do_scan_bus = 1;
+ while(do_scan_bus) {
+ int link;
+ new_max = bus->ops->scan_bus(bus, max);
+ do_scan_bus = 0;
+ for(link = 0; link < bus->links; link++) {
+ if (bus->link[link].reset_needed) {
+ if (reset_bus(&bus->link[link])) {
+ do_scan_bus = 1;
+ } else {
+ bus->bus->reset_needed = 1;
+ }
+ }
+ }
+ }
+ return new_max;
+}
+
+
/**
- * @brief Determine the existence of dynamic devices and construct dynamic
+ * @brief Determine the existence of devices and extend the device tree.
+ *
+ * Most of the devices in the system are listed in the mainboard Config.lb
+ * file. The device structures for these devices are generated at compile
+ * time by the config tool and are organized into the device tree. This
+ * function determines if the devices created at compile time actually exist
+ * in the physical system.
+ *
+ * For devices in the physical system but not listed in the Config.lb file,
+ * the device structures have to be created at run time and attached to the
* device tree.
*
- * Start from the root device 'dev_root', scan the buses in the system
- * recursively, build the dynamic device tree according to the result
- * of the probe.
+ * This function starts from the root device 'dev_root', scan the buses in
+ * the system recursively, modify the device tree according to the result of
+ * the probe.
*
* This function has no idea how to scan and probe buses and devices at all.
* It depends on the bus/device specific scan_bus() method to do it. The
- * scan_bus() function also has to create the device structure and attach
+ * scan_bus() method also has to create the device structure and attach
* it to the device tree.
*/
void dev_enumerate(void)
printk_err("dev_root missing scan_bus operation");
return;
}
- subordinate = root->ops->scan_bus(root, 0);
+ subordinate = scan_bus(root, 0);
printk_info("done\n");
}
-
/**
* @brief Configure devices on the devices tree.
*
- * Starting at the root of the dynamic device tree, travel recursively,
- * and compute resources needed by each device and allocate them.
+ * Starting at the root of the device tree, travel it recursively in two
+ * passes. In the first pass, we compute and allocate resources (ranges)
+ * requried by each device. In the second pass, the resources ranges are
+ * relocated to their final position and stored to the hardware.
*
* I/O resources start at DEVICE_IO_START and grow upward. MEM resources start
* at DEVICE_MEM_START and grow downward.
printk_err("dev_root missing set_resources\n");
return;
}
+
+ printk_info("Reading resources...\n");
root->ops->read_resources(root);
+ printk_info("Done reading resources.\n");
/* Get the resources */
io = &root->resource[0];
mem->flags |= IORESOURCE_ASSIGNED;
mem->flags &= ~IORESOURCE_STORED;
+#if CONFIG_CONSOLE_VGA == 1
/* Allocate the VGA I/O resource.. */
allocate_vga_resource();
+#endif
/* Store the computed resource allocations into device registers ... */
+ printk_info("Setting resources...\n");
root->ops->set_resources(root);
-
+ printk_info("Done setting resources.\n");
#if 0
mem->flags |= IORESOURCE_STORED;
report_resource_stored(root, mem, "");
#endif
- printk_info("done.\n");
+ printk_info("Done allocating resources.\n");
}
/**
*/
void dev_enable(void)
{
- printk_info("Enabling resourcess...\n");
+ printk_info("Enabling resources...\n");
/* now enable everything. */
enable_resources(&dev_root);
* @brief Initialize all devices in the global device list.
*
* Starting at the first device on the global device link list,
- * walk the list and call a driver to do device specific setup.
+ * walk the list and call the device's init() method to do deivce
+ * specific setup.
*/
void dev_initialize(void)
{
if (dev->enabled && !dev->initialized &&
dev->ops && dev->ops->init)
{
+ if (dev->path.type == DEVICE_PATH_I2C) {
+ printk_debug("smbus: %s[%d]->",
+ dev_path(dev->bus->dev), dev->bus->link);
+ }
printk_debug("%s init\n", dev_path(dev));
dev->initialized = 1;
dev->ops->init(dev);
projects / coreboot.git / blobdiff